Buffer Occupancy Based Link Prioritization for Cooperative Wireless Networks

Abstract

This paper presents a decisive threshold termed as the buffer-threshold to control the selection probability of source-relay (SR) or relay-destination (RD) links for the buffer aided cooperative wireless networks. The weights of the links are reassigned using buffer-threshold and a link with the maximum weight is activated. The proposed scheme is termed as Buffer-Threshold based relay selection scheme (BTRS). The relations of the outage probability (OP) and the average delay are calculated by the Markov Modelling of the buffers. Theoretical results are analyzed for different cases of the buffer-threshold and validated by the Monte-carlo simulations. For the performance evaluation BTRS is compared with the max link relay selection (MLRS) scheme and the max weight relay selection (MWRS) scheme and outperforms its counterparts in terms of the average delay.